Add TimeSlice Defenitions in the Config File about osemosys_global

[trevorb1]

How are we wanting to add timeslice definitions to the config file? Right now it looks like the timeslice structure is defined in OPG_TS_Data.py here...

In the config file we currently only give an option to include daytype as True or False. Are we wanting to go further and give more flexibility? (ie. separate by hours, days, months, seasons)

[tniet]

@abhishek0208 - Let's also adjust the TS naming convention to make it S01D01 so we can have a 2 digit season and a 2 digit day.

[trevorb1]

The ts_dayparts.csv and ts_seasons.csv info to get moved to the config file

[trevorb1]

Added daypart and seasons to config file. In the most recent ts_seasons.csv file there are also columns for month name (January, February, ...) and days in the season. Instead of putting these into the config file, its probably just easier to use the datetime python library. These columns are only used in the visualization script, so I will hold off on making that change until we are all on the same page with the current state of everything